The experiment was simple. The T shirts were carefully prepared (no cologne, no cigarettes, no sex) and then placed in boxes where they could be smelled but not seen. Forty-nine unmarried women were asked to sniff the boxes and choose which box they would prefer "if they had to smell it all the time."
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The results would have made Sigmund Freud proud. The women were attracted to the smell of a man who was genetically similar--but not too similar--to their dads. McClintock thinks there's an evolutionary explanation. "Mating with someone too similar might lead to inbreeding," she says. Mating with someone too different "leads to the loss of desirable gene combinations."
McClintock isn't suggesting you can attract a mate by smell alone, but that hasn't discouraged companies like Erox from bottling pheromones and stopping just short of calling them aphrodisiacs. Marketing websites feature links to scientific papers on the power of pheromones. I spoke to Dr. David Berliner, CEO of Pherin Pharmaceuticals, who did some of the initial research. While working at the University of Utah with natural compounds produced by human skin, he noticed a surprising change in the behavior of his male and female colleagues. "They developed an increased level of camaraderie that was hard to explain," he says. There were smiles, eye contact and increased approachability until the skin extracts were removed, at which point the group reverted to normal behavior.
But even Berliner balks at categorizing pheromones as aphrodisiacs. "I've been looking for an aphrodisiac for 11 years, and I'm convinced that there is no such thing," he says. The Food and Drug Administration agrees. It surveyed purported love potions--from oysters to rhino horn--and determined that none of them work. This Valentine's Day, I think I'll stick with flowers, a card and some chocolate.
Dr. Gupta is a neurosurgeon and CNN medical correspondent